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Concentrations of Credit Risk (Tables)
 12 Months Ended
Jun. 30, 2015
Risks and Uncertainties [Abstract]  
Schedule of customers from whom the entity derived 10 percent or more of net oil and natural gas revenues
.
 
Year Ended June 30,
Customer
2015
 
2014
 
2013
Plains Marketing L.P. (includes Delhi production)
99
%
 
96
%
 
90
%
Enterprise Crude Oil LLC
—
%
 
2
%
 
4
%
Flint Hills
—
%
 
1
%
 
2
%
ETC Texas Pipeline, LTD. 
—
%
 
1
%
 
—
%
All others
1
%
 
—
%
 
4
%
Total
100
%
 
100
%
 
100
%